. 2021 Mar 6;26(5):1433. doi: 10.3390/molecules26051433
© 2021 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Figure 13.
Molecular structures of compounds 56–61.